test: enable tsan standalone test for x86_64-freebsd and aarch64-freebsd

Author: alexrp

test/standalone/tsan/build.zig

@@ -11,8 +11,8 @@ pub fn build(b: *std.Build) !void {
         .{ .linux, &.{ .aarch64, .aarch64_be, .loongarch64, .powerpc64, .powerpc64le, .riscv64, .x86_64 } },
         .{ .macos, &.{ .aarch64, .x86_64 } },
 
-        // https://github.com/ziglang/zig/issues/24841
-        // .{ .freebsd, &.{ .aarch64, .powerpc64, .powerpc64le, .riscv64, .x86_64 } },
+        // powerpc64, powerpc64le, and riscv64 are not supported by TSan yet.
+        .{ .freebsd, &.{ .aarch64, .x86_64 } },
 
         .{ .netbsd, &.{.x86_64} },